Posted by Steve Simon on June 6, 2015, 5:08 pm, in reply to "Mean Field Theory and Heisenberg Model"
In mean field theory Ising spin 1/2 and Heisenberg spin 1/2 actually behave the same way. Starting with Si dot Sj = Szi Szj + Sxi Sxj + Syi Syj Let us say we are looking at site i, then Sj becomes Si dot 
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